1999 Plymouth Voyager Rattling noise and vehicle vibration

My van is making a rattling sound from the passenger rear wheel area whenever I go over a bump. It is also vibrating the whole vehicle at highway speeds, but only intermittently. When it starts to vibrate, I can slow down and it will eventually stop. I don't know if the two problems are related or not. I also don't know if it is pertinent information or not but I had the rear brake shoes replaced, cylinders replaced, and drums turned this past July.
Thanks very much.

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Saturday, December 13th, 2008 AT 8:00 PM

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ZACKMAN

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Pull the rear brake on that side, and check to make sure everything is in order. I think one of the springs came loose/broke off.

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Sunday, December 14th, 2008 AT 5:36 PM

SAINTBERNARD

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Will a broken spring on the brake assembly make the whole vehicle vibrate? The vibration is similar to a badly bent rim.
Thanks for the reply!

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Sunday, December 14th, 2008 AT 9:02 PM

ZACKMAN

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Yes, it will.

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Monday, December 15th, 2008 AT 4:44 PM

SAINTBERNARD

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Well, after working the 'look at the problem' time into my hectic life, I pulled the wheel again, pulled the drum, and didn't find any broken springs or anything. I can move the brake assembly up and down by hand and noticed that there are two springs, one on either shoe, with a post coming from the back of the assembly to the front and they seemed loose. I took the van to the brake shop and they say that the brakes are fine. It still rattles. Any other ideas? I think I will take it to another branch of the same chain for a second opinion.
TIA

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Wednesday, January 7th, 2009 AT 8:34 PM

ZACKMAN

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[Quote]It is also vibrating the whole vehicle at highway speeds, but only intermittently[end quote]

You also may want to check these suspension parts, along with the shock absorber and the wheel (for possible bent rim - but I highly doubt it).